Lifting-jack



(No Model.)

A. A. STROM.

LIPTING JACK.

No. 394,308. Patented Deo. 11, 1888.

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Imm o IIIIHIIIIIIIIIIIIIIIUII `mmm f 0 y i 7 "ma 70 lgiuigl ...Manul- UNITED STATES PATENT OFFICE.

AXEL A. STROM, OF AUSTIN, ILLINOIS.

LIFTING-JACK.

SPECIFICATION forming part of Letters Patent No. 394,308, dated December 11, 1888.

Appllcation led July 21, 1888. Serial No. 280,640. (No model.)

To all when@ it Utay concern.'

Be it known that I, AXEL A. STRoM,a citizen of the United States, residing at Austin, in the county of Cook and State of Illinois, have inventeda new and useful Improvement in Lifting-.I ae'ks1 of which the following' is a specification. Y

My invention relates particularly to au improved construction of the friction-clutch p0rtion of the lifting-jack employed as the immediate means for raisin g the liftin g-bar,when it is entitled the lifting-eluteh, being connected with and actuated from a lever tulerumed on the stai'idaii'd and for retaining the lifting-bar in its raised position, when it affords the retaining-clutch.

The lifting and retaining clutches in a lifting-jack may both involve substantially the same construction or may differ as to their construction, and itl is therefore within the spirit of my il'ivention to employ in one lifting-jack my present improved form of el utch for one of the stated purposes and any other suitable form ot clutch for the other purpose, though both are shown to involve substantially the same construction in the accompanying drawings, in which- Figure l shows in side elevation,with a portion of the operatiiig-lever broken away, a lifting-jack provided rwith my improved friction-clutch device. Fig. 2 shows the same as Fig. l in vertical section. Fig. El shows my improvement in section, both as a lifting and as a retaining clutch in proper positions on a lifting-bar, the latter being indica-ted by dotted lines; and Fig. l shows a perspective view ot' the friction-clutch.

The objects of my improvement are to afford a construction of friction-clutch for lifting-jacks whereby longer surface-bearings than have hitherto been had in clutches of somewhat similar construction shall be provided, thus permitting' the gripping effect to be prod uced with slighter tippin and decreasing the rapidity of wear on the bearing parts.

A is a lifting-jack, ot' any suitable construetion, to which my improved form of frictionclutch is adaptable, the construction of parts shown other than the clutches being' in the main that illustrated and described in Letters Patent of the United States, No. 383,156, granted me on the 21st day of August, 1888.

l B is the hollow standard portion; C, the lifting-bar; D, the lever for actuating the lifting-clutch through a suitable link-connection q; and r, a guide-collar in the standard for the lifting-bar, the collar being merely a web connecting the two sides of the expanded portion of the standard and having a .central opening for the lifting-bar, like the guidecollar in various well-known forms of liftingjacks, wherein it performs the same function of a guide surroumling the lifting-bar toward the upper end ot' the standard.

The parts thus referred to not being new in f the present connection arc not described more t in detail.

E is the lifting-clutch, comprising` a collar, p, preferably conforming in shape, at least as to its inner side, to that of the cross-section of the bar C, which passes through it, and having a handle projection, o, extending from one Outer side, at which to connect it with the short end of the lever D, through the linkeonnection q. The inner side of the collar adjacent to the outer side thereof from which the handle o extends affords the bearing-surface n, Fig. fi, of the clutch against one side of the lifting-bar, while the side of the eollar directly opposite the surface n may be open, as shown, or not, if prefi-n'rcd, a lip, in, extending from the underside of the collar and thus beyond the same, and aiiording outside the collar the beari11g-surface for the opposite side of the bar.

By lowering the long arm of the lever D the clutch E is tipped, bringing the bearing-surface n. and lip nz against opposite sides of the bar and on diiferent planes, whereby the bar is rmly gripped and caused to rise with whatever load may be upon` it by the power exerted at the lever, and the construction affords long bearing-surfaces with the least quantity of material, thereby also requiriu very slight tipping of the clutch to produce the desired gripping effect an d with comparatively little wear on the bimling-surtaces.

The retaining-clutch E `involves in the collar p', having the bearing-surface 'n' inside the collar, and lip in. at the opposite side of the same, the saine construction as the liftingclutch, the difference between the two being that the projection o is extended, as shown, farther than the part o to afford a handle suf- IOO ciently long to perinit its ready manipulathe bar, a lip, m, integral with and extending tion. The clutch E is in reverse position on the bar with relation to the lifting-clutch, in order that the handle o may extend at the side of the jack where the operator stands,

and thus be within ready access, and that the clutch may be fulcruined ou the seat I, 'formed at the base of the expanded upper portion of the standard B. As the clutch E tends by its own Weight to tip upon its support, it normally grips the har and prevents its falling When raised, the gripping effect being in creased by the weight of the load on the bar. To release the retaining-clutch, pressure is exerted on the handle o', whereby the collar 2) is straightened and the gripping effect den Stroyed.

NVhat I clailn as new, and desire to secure by Letters Patent, is-

l. In a lifting-jack, the combination, with the standard B, lifting-bar C, and operatinglever D, of a lifting-clutcl1,E, comprising a collar, p, on the bar having a bearing-surface, n, on one inner side for the adjacentside of perpendicularly from its opposite side and affording a bearing-surl'ace against the other side ot' the har outside of the collar, a handle, 0, extending from the collar, and a link, q, connecting the clutch E from the handle 0 with the lever D, anda suitable retainingclutch, substantially as described.

2. In a lifting-jack, the combination, with the standard B, lifting-bar C, and operatinglever D, ot' a suitable lifting-clutch and a retaining-clutch, E, comprising a collar, p', on the bar and supported on the standard, and having a bearing-surface, lnf,on one inner side for the adjacent side of the bar, a lip, m, integral with and extending from its opposite side and all'ording a hearing-surface against the other side of the har outside of the collar, and a handle, 0, extending from the collar, substantially as described.

AXEL A. STROM.

In presence of- M. J. BOWERS, J. W. DYRENFORTH. 

